| Class | Description | 
|---|---|
| Pointer | Base class of pointers, which hold metadata and offsets about
  blocks elsewhere in the file | 
| PointerFactory | Factor class to create the appropriate pointers, based on the version
  of the file | 
| PointerV5 | A Pointer from v5 | 
| PointerV6 | A Pointer from v6+ | 
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